rolf j



2 Sheets-Sheet 1.

(No Model.)

B. J. ROLFSON.

GARBURETOR.

Patented Nov. 28, 1893.

(No Model.) 2 Sheets'-Sheet 2.

R. J. ROLPSON.

GARBURETOR.

No. 509,828. Patented Nov. 28, 1893.

NITED STATES PATENT OFFICE.

RCLE J. ROLFSON, or SAN FRANCISCO, CALIFORNIA, ASSIGNOR- "r0 THE UNIONGAS ENGINE COMPANY, OF SAME PLACE.

CARBURETOR.

SPECIFICATION forming part of Letters Patent No. 509,828, dated November28, 1893.

Application filed April 22, 1893. Serial No. 471.422. (No model.)

To (ZZZ whom it may concern:

Be it known that I, ROLE J. ROLFSON, a citizen of the United States,residing at San Francisco, in the county of San Francisco and State ofCalifornia, have invented certain new and useful Improvements inCarburetors; and I do hereby declare the following to be a f ull, clear,and exact description of said invention,such as will enable othersskilled in the art to which it most nearly appertains to make, use, andpractice the same.

This invention relates to certain new and useful improvements incarburetors for gas engines, which consist in the arrangement of partsand details of construction as will bellereinafter more fully set forthin the drawlugs, described and pointed out in the specification.

My present invention relates more especially to certain improvementsupon the apparatus fully set forth in Letters Patent N 0. 498,447,granted to me on May 30, 1893, to which reference is hereto made forafull understanding of the Working of this invention.

In the aforesaid patent, the outer casing or shell of the device isdescribed as being constructed of glass, the purpose of which was toenable the operator to see therein in order to regulate or adjust theoil feed valve relative to the air inlet valve, and at the same time towatch the workingthereof. This form of construction I find to be quiteexpensive, inasmuch as it necessitates the making of the carburetor inmany parts. Consequently the object of the present invention is to makethe entire carburetor of metal, thus allowing it to be manufactured inone casting, and at the same time permit inspection of the vaporizing orcarbureting chamber in order to adjust the oil feed valves, in thismanner greatly reducing the cost of manufacture.

In order to more fully understand my invention, reference must be had tothe accompanying drawings, wherein similar letters of reference are usedto denote corresponding parts throughout the entire specification andseveral views.

Figure 1, is a vertical sectional view of the carburetor showing thearrangement of the difierent parts; Fig. 2, a side elevation of theentire device. Fig. 3, is a cross sectional bottom plan taken on linel-l, Fig.1. Fig. 4, is a cross sectional top plan View taken on line22Fig. 1; Fig. 5,a similar view through line'3-3- Fig. 1; Fig. 6, crosssectional top plan on line 44 Fig. 1; and Fig. 7, is a similar viewtaken on line 55- Fig. 1.

The letter A is used to indicate the stationary shell or casing of mydevice, which by preference, I cast cylindrical inshape. This casing isdivided by the partition plate or platform A, which provides avaporizing or carbureting chamber A Below the plate A, is locatedanother plate B, the two being connected by the walls a Into thischamber extends the hot air inlet pipe B, which leads from the engineheater, as fully described in my above mentioned patent. From the plateA, extends the annular wall or flange B which projects within thecarbureting chamber A This annular Wall or flange forms an outletpassage 19, through which the hot air flows from chamber 01., intocarburetin g chamber A The flow of air through said passage-way iscontrolled by the dome-shaped valve C, fitting thereover, which valve israised or lowered through the medium of the valve stem C, which passesthrough valve stem guide 0, and plate B, and guide 0, as shown. The liftof said stem and valve is regulated by the end plate C contacting withthe worm collar D, which is raised or lowered by the action of theengine governor through the medium of the operating handle D. The mannerof operating these parts is fully set forth in my aforesaid Patent No.498,447 and a specific description thereof is unnecessary at this time.

The outlet passage for the carbureted gas, which leads to the enginecylinder in the usual manner, is represented by the letter E, the wall2, of said outlet passage having an opening e, cut therethrough, whichcommunicates with chamber E.

It will be observed that plates A and B are cast in the form of a Greekcross, thus forming passage-ways f, which connect the carburetingchambenA and chamber E, and through which the carbureted gas passes. Somuch of the device as has been described, excepting the dome-shapedvalve and its operating mechanism, is formed in one casting.

Through the upper portion of the casting or shell A, is out, or cast,the openings F, asf shown, which permit the interior of the carmalethreads f out" thereon, which register with female threads), cut inflange F. In this manner I make the cap F rotatable, thus permitting thesame to be raised or lowered. Through the top of the cap F,vextends theplug H, which is provided with an oil passage h, the lower portion ofwhich is tapered. Within this plug fits and works the tapering feedvalve H the lower end of which extends beyond this plug and projectswithin the carbureting chamber andis raised or lowered, in order tocontrol the supply of gasoline, 850., by the action of the dome-shapedvalve. The construction, arrangement and operation of this valve arefully set forth in my prior patent hereinbefore mentioned to whichreference is made.

When my carburetoris used in connection with a single cylinder engine,it sufifices to permit the downward action or movement of the oil feedvalve to take place by gravity, but when used in connection with adouble cylinder gas engine, the movement thereof must be accelerated andfor this purpose I surround the same with the spring W, the upper end ofwhich is secured to projecting end of hollow plug H, and the lower endto collar h, secured to end of tapering oil feed valve H as shown. Thisspring serves to increase the downward movement of the valve.

When the carburetor is connected to the gasengine, the oil feed valvemust be regulated to the dome-shaped valve for the purpose of permittingof a certain flow of gasoline, &;c., to a given quantity of hot air;Consequently the distance between the two valves must be increased ordecreased in accordance therewith. In order to so regulate the movementof the oil feed valve it is necessary to examine the interior of thecarbnreting chamber while the engine is working, and for this purposethe upper portion of the casing or shell A, is provided with the portopenings F, and the rotatable cap is also provided with opening or portsI, which register with the port openings F, when the cap is turned theproper distance. After the valve has been properly adjusted, the cap isturned to such a position as to permit the solid portion thereof toclose the port openings F, and is secured in place by means of handscrew or bolt I, which passes through the wall thereof, as shown in Fig.4.

By raising or lowering the rotatable cap upon the carburetor, the oilfeed valve is likewise raised or lowered as required, but the cap cannotbe rotated so as to raise or lower without first unscrewing the bolt orscrew I. Thus it will be seen that the bolt or screw serves to limit therotation of the cap.

The admission of hot air and gasoline to the carbureting chamber iscontrolled through the medium of the worm collar, before described, butthe arrangement of the valves 18 such that the proportion of air andgasoline always remain the same whether the domeshaped valve is alloweda full or limited stroke.

Having thus described my invention, what I claim as new, and desire tosecure protection in by Letters Patent, is I 1. In a carburetor, thecombination of the outer casing having a vaporizing chamber and providedwith an air inlet and a gas outlet, and a rotatable cap mounted upon andfitting over the casing and provided with a valved oil inlet.

2. In a carburetor, the combination of the outer casing having avaporizing chamber and provided with an air inlet and a gas outletcommunicating with said chamber, a valve controlling the airinlet, arotatable cap fitting over and mounted upon the casing and pro- *videdwith an oil inlet, and a spring-actuated valve controlling the flowthrough the oil inlet.

3. In a carburetor, the combination of the casing having a series ofthreaded lugs on its outer side and provided with a series of openingsin its upper edge, and a threaded cap engaging said lugs and having aseries of openings in its side adapted to register with the openings inthe casing, said cap carrying an oil-feed valve.

4. In a carburetor, the combination of the casing having integral wallsand partitions forming a vaporizing chamber, an air inlet and a gasoutlet, a valve controlling the air inlet, and a rotatable cap mountedon and fitting over the casing and provided with a valved oil inlet.

In testimony whereof I affix my signature in presence of two witnesses.

ROLF J. ROLFSON.

Witnesses:

N. A. ACKER, M. Gr. LOEFLER.

